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Virtuoso.php
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Virtuoso.php
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<?php
/**
* This file is part of the {@link http://erfurt-framework.org Erfurt} project.
*
* @copyright Copyright (c) 2012, {@link http://aksw.org AKSW}
* @license http://opensource.org/licenses/gpl-license.php GNU General Public License (GPL)
*/
require_once 'Erfurt/Store.php';
/**
* OpenLink Virtuoso Adapter for the Erfurt Semantic Web Framework.
*
* Connects to a Virtuoso via ODBC, therefore requires PHP to be compiled with the ODBC extension.
*
* @category Erfurt
* @package Erfurt_Store_Adapter
* @author Norman Heino <norman.heino@gmail.com>
* @author Philipp Frischmuth <pfrischmuth@googlemail.com>
*/
class Erfurt_Store_Adapter_Virtuoso implements Erfurt_Store_Adapter_Interface, Erfurt_Store_Sql_Interface
{
// ------------------------------------------------------------------------
// --- Class Constants ----------------------------------------------------
// ------------------------------------------------------------------------
/**
* Prefix for blanknode identifiers.
* @var string
*/
const BLANKNODE_PREFIX = 'nodeID://';
/**
* Name for the fulltext index.
* @var string
*/
const FULLTEXT_INDEX_NAME = 'erfurt_ft_index';
// ------------------------------------------------------------------------
// --- Protected Properties -----------------------------------------------
// ------------------------------------------------------------------------
/**
* ODBC connection identifier.
* @var int
*/
protected $_connection = null;
/**
* Adapter option array
* @var array
*/
protected $_adapterOptions = null;
/**
* The available graphs in this store.
* @var array
*/
protected $_graphs = null;
/**
* Model imports cache.
* @var array
*/
protected $_importedModels = array();
/**
* Whether there are ongoing transactions.
* @var boolean
*/
protected $_transactions = false;
/**
* The user performing db requests
* @var string
*/
protected $_user = null;
/**
* Graph URIs internally used by Virtuoso
* @var array
*/
protected $_virtuosoSpecialGraphs = array(
'http://www.openlinksw.com/schemas/virtrdf#',
'http://localhost:8890/DAV'
);
private $_isOpenSourceVersion = true;
private $_httpClientAdapter = null;
// ------------------------------------------------------------------------
// --- Magic Methods ------------------------------------------------------
// ------------------------------------------------------------------------
/**
* Constructor.
*
* @throws Erfurt_Store_Adapter_Exception
*/
public function __construct($adapterOptions = array())
{
// check for odbc extension
if (!extension_loaded('odbc')) {
throw new Erfurt_Store_Adapter_Exception('Virtuoso adapter requires the ODBC extension to be loaded.');
exit;
}
$this->_adapterOptions = $adapterOptions;
if (isset($adapterOptions['is_open_source_version'])) {
$this->_isOpenSourceVersion = (bool)$adapterOptions['is_open_source_version'];
}
// Access the connection in order to check whether it works.
$this->connection();
}
/**
* Destructor
*
* @throws Erfurt_Exception
*/
public function __destruct()
{
// check for ongoing transactions
if ($this->_transactions) {
throw new Erfurt_Store_Adapter_Exception('Cannot close the connection while transactions are open.');
}
$this->_closeConnection();
}
// ------------------------------------------------------------------------
// --- Public Methods (Erfurt_Store_Adapter_Interface) --------------------
// ------------------------------------------------------------------------
/**
* @see Erfurt_Store_Adapter_Interface
*/
public function addMultipleStatements($graphUri, array $statementsArray, array $options = array())
{
$numBlocks = 1;
$blockQueries = array();
while (true) {
$statementBlocks = $this->array_split($statementsArray, $numBlocks);
$blockQueries = array();
foreach ($statementBlocks as $statementBlock) {
$blockQuery = sprintf(
'INSERT INTO GRAPH <%s> {%s}',
$graphUri,
$this->buildTripleString($statementBlock)
);
//split when too many linebreaks (virtuoso has a limit of 10'000 - but in sql...?!)
if (substr_count($blockQuery, "\n") > 1000) {
$numBlocks *= 2;
continue 2;
}
$blockQueries[] = $blockQuery;
}
break; //this only reached if the continue call is not reached
}
$odbcRes = true;
foreach ($blockQueries as $query) {
if (defined('_EFDEBUG')) {
$logger = Erfurt_App::getInstance()->getLog();
$logger->debug('Add multiple statements query: ' . PHP_EOL . $query);
}
$odbcRes = $this->_execSparqlUpdate($query);
}
}
// split the given array into n number of pieces
private function array_split($array, $pieces=2)
{
if ($pieces < 2)
return array($array);
$newCount = ceil(count($array)/$pieces);
$a = array_slice($array, 0, $newCount);
$b = $this->array_split(array_slice($array, $newCount), $pieces-1);
return array_merge(array($a), $b);
}
/**
* @see Erfurt_Store_Adapter_Interface
*/
public function addStatement($graphUri, $subject, $predicate, array $objectSpec, array $options = array())
{
extract($objectSpec);
if ($type == 'uri') {
$object = '<' . $value . '>';
} else {
$object = $this->buildLiteralString(
$value,
isset($datatype) ? $datatype : null,
isset($lang) ? $lang : null
);
}
// TODO: support blank nodes as subject
$insertSparql = '
INSERT INTO GRAPH <' . $graphUri . '> {
<' . $subject . '> <' . $predicate . '> ' . $object . '
}';
if (defined('_EFDEBUG')) {
$logger = Erfurt_App::getInstance()->getLog();
$logger->debug('Add statement query: ' . PHP_EOL . $insertSparql);
}
return $this->_execSparqlUpdate($insertSparql);
}
/**
* Explicitly creates a new named graph.
*
* @param string $graphUri
* @param string $baseUri
* @return boolean
*/
public function createModel($graphUri, $type = Erfurt_Store::MODEL_TYPE_OWL)
{
// create empty graph
$createQuery = "CREATE SILENT GRAPH <$graphUri>";
$this->_execSparqlUpdate($createQuery);
if ($type === Erfurt_Store::MODEL_TYPE_OWL) {
// add statement <graph> a owl:Ontology
$owlInsert = sprintf('INSERT INTO GRAPH <%s> {<%s> a <%s>.}', $graphUri, $graphUri, EF_OWL_ONTOLOGY);
$this->_execSparqlUpdate($owlInsert);
}
// force reloading graphs next time
$this->_graphs = null;
return true;
}
/**
* Returns the current connection resource.
* The resource is created lazily if it doesn't exist.
* @retun resource
*/
public function connection()
{
if (!$this->_connection) {
$options = $this->_adapterOptions;
// ini_set('odbc.default_cursortype', SQL_CURSOR_FORWARD_ONLY);
// determine connection function
if ((isset($options['use_persistent_connection'])) &&
((boolean) $options['use_persistent_connection'] === true)) {
$odbcConnectFunction = 'odbc_pconnect';
} else {
$odbcConnectFunction = 'odbc_connect';
}
// try to connect
if (function_exists('__virt_internal_dsn')) {
// via Virtuoso hosting
$this->_connection = $odbcConnectFunction(__virt_internal_dsn(), null, null);
} else {
// check for dsn parameter
if (!isset($options['dsn'])) {
throw new Erfurt_Store_Adapter_Exception(
'Your config.ini lacks a store.virtuoso.dsn parameter.'
);
} else {
$dsn = (string) $options['dsn'];
}
// check for username parameter
if (!isset($options['username'])) {
throw new Erfurt_Store_Adapter_Exception(
'Your config.ini lacks a store.virtuoso.username parameter.'
);
} else {
$username = (string) $options['username'];
}
// check for password parameter
if (!isset($options['password'])) {
throw new Erfurt_Store_Adapter_Exception(
'Your config.ini lacks a store.virtuoso.password parameter.'
);
} else {
$password = (string) $options['password'];
}
// via php_odbc
$this->_connection = @$odbcConnectFunction($dsn, $username, $password);
$this->_user = $username;
}
// success?
if (false === $this->_connection) {
throw new Erfurt_Store_Adapter_Exception('Unable to connect to Virtuoso Universal Server via ODBC.');
exit;
}
}
return $this->_connection;
}
/**
* @see Erfurt_Store_Adapter_Interface
*/
public function deleteMatchingStatements($graphUri, $subject, $predicate, $object, array $options = array())
{
if (empty($graphUri)) {
throw new Erfurt_Store_Adapter_Exception('No graph URI given.');
}
$graphSpec = '<' . (string)$graphUri . '>';
$subjectSpec = $subject ? '<' . (string)$subject . '>' : '?s';
$predicateSpec = $predicate ? '<' . (string)$predicate . '>' : '?p';
if (null !== $object) {
if ($object['type'] == 'uri') {
$objectSpec = '<' . $object['value'] . '>';
} else {
$objectSpec = $this->buildLiteralString(
$object['value'],
array_key_exists('datatype', $object) ? $object['datatype'] : null,
array_key_exists('lang', $object) ? $object['lang'] : null
);
}
} else {
$objectSpec = '?o';
}
$deleteSparql = sprintf(
'DELETE FROM GRAPH %s {%s %s %s.} WHERE {%s %s %s}',
$graphSpec,
$subjectSpec,
$predicateSpec,
$objectSpec,
$subjectSpec,
$predicateSpec,
$objectSpec
);
// perform delete
if ($rid = $this->_execSparqlUpdate($deleteSparql)) {
if (odbc_num_fields($rid) > 0) {
// Virtuoso <= 6.1.4 returned 1 row with metadata for update queries!
$deleteResult = (string)odbc_result($rid, 1);
// extract number of deleted statements
$matches = array();
preg_match('/,\s*(\d)\s*triples/i', $deleteResult, $matches);
if (isset($matches[1])) {
// return number of deleted statements
return (int)$matches[1];
}
} else {
// As of Virtuoso 6.1.5 they do it the documented ODBC way, which means
// odbc_num_rows contains the number of affected rows for updated queries.
// If no rows were affected Virtuoso returns -1.
$affectedRows = odbc_num_rows($rid);
if ($affectedRows === -1) {
return 0;
}
return $affectedRows;
}
}
// no statements deleted
return 0;
}
/**
* @see Erfurt_Store_Adapter_Interface
*/
public function deleteMultipleStatements($graphUri, array $statementsArray)
{
$deleteSparql = sprintf(
'DELETE FROM GRAPH <%s> {%s}',
$graphUri,
$this->buildTripleString($statementsArray)
);
if (defined('_EFDEBUG')) {
$logger = Erfurt_App::getInstance()->getLog();
$logger->debug('Delete multiple statements query:' . PHP_EOL . $deleteSparql);
}
return $this->_execSparqlUpdate($deleteSparql);
}
/**
* @see Erfurt_Store_Adapter_Interface
*/
public function deleteModel($graphUri)
{
// delete explicit graph
$result = $this->_execSparqlUpdate('DROP SILENT GRAPH <' . $graphUri . '>');
$this->_graphs = null;
return $result;
}
/**
* @see Erfurt_Store_Adapter_Interface
* @todo implement
*/
public function exportRdf($graphUri, $serializationType = 'xml', $filename = null)
{
throw new Erfurt_Store_Adapter_Exception('RDF export not implemented yet.');
}
/**
* @see Erfurt_Store_Adapter_Interface
*/
public function getAvailableModels()
{
if (null === $this->_graphs) {
$this->_graphs = array();
$rid = $this->_execSql(
'SELECT ID_TO_IRI(REC_GRAPH_IID) AS GRAPH FROM DB.DBA.RDF_EXPLICITLY_CREATED_GRAPH'
);
if ($rid) {
$graphs = $this->_odbcResultToArray($rid, false, 'GRAPH');
$this->_graphs = array();
foreach ($graphs as $graph) {
$this->_graphs[$graph] = array('modelIri' => $graph);
}
}
}
return $this->_graphs;
}
/**
* @see Erfurt_Store_Adapter_Interface
*/
public function getBlankNodePrefix()
{
return self::BLANKNODE_PREFIX;
}
/**
* @see Erfurt_Store
*/
public function getLogoUri()
{
return $this->_xyz();
}
/**
* @see Erfurt_Store
*/
public function getSearchPattern($stringSpec, $graphUris, $options)
{
if ($options['filter_properties']) {
throw new Erfurt_Store_Adapter_Exception(
'getSearchPattern option filter_properties not implemented in Virtuoso adapter yet.'
);
}
$searchPattern = array();
$subjectVariable = new Erfurt_Sparql_Query2_Var('resourceUri');
$predicateVariable = new Erfurt_Sparql_Query2_Var('p');
$objectVariable = new Erfurt_Sparql_Query2_Var('o');
$defaultTriplePattern = new Erfurt_Sparql_Query2_Triple(
$subjectVariable,
$predicateVariable,
$objectVariable
);
$searchPattern[] = $defaultTriplePattern;
// look for a bif:contains string limit in config
$bifLimit = null;
if (isset($this->_adapterOptions['search_max_length_for_bifcontains'])) {
$bifLimit = (int) $this->_adapterOptions['search_max_length_for_bifcontains'];
}
if ((isset($bifLimit)) && (strlen($stringSpec)) < $bifLimit) {
// string is < bifLimit character => use FILTER (str(?o) = "..."))
$strExpression = new Erfurt_Sparql_Query2_Str($objectVariable);
$literalExpression = new Erfurt_Sparql_Query2_RDFLiteral($stringSpec);
$filter = new Erfurt_Sparql_Query2_Filter(
new Erfurt_Sparql_Query2_Equals($strExpression, $literalExpression)
);
} else {
// string >= bifLimit characters
// if (false === strpos($stringSpec, '*')) {
// $stringSpec .= '*';
// }
$bifPrefix = new Erfurt_Sparql_Query2_Prefix(
'bif',
new Erfurt_Sparql_Query2_IriRef('SparqlProcessorShouldKnow')
);
$bifContains = new Erfurt_Sparql_Query2_IriRef('contains', $bifPrefix);
$filter = new Erfurt_Sparql_Query2_Filter(
new Erfurt_Sparql_Query2_ConditionalOrExpression(
array(
/*new Erfurt_Sparql_Query2_Function(
$bifContains,
array($subjectVariable, new Erfurt_Sparql_Query2_RDFLiteral($stringSpec))
),
// why doesnt this work???
// ANSWER: bif:contains uses virtuoso specific fulltext index only
// available for object column uris could only be treated as codepoint representation
// of themselves -> Solution again is IRI (maybe not before PHP 6)
*/
new Erfurt_Sparql_Query2_Function(
$bifContains,
array($objectVariable, new Erfurt_Sparql_Query2_RDFLiteral($stringSpec, null, '"\''))
)
)
)
);
}
$searchPattern[] = $filter;
#var_dump((string)$searchPattern[1]);exit;
return $searchPattern;
}
/**
* @see Erfurt_Store_Adapter_Interface
*/
public function getSupportedExportFormats()
{
return array();
}
/**
* @see Erfurt_Store_Adapter_Interface
*/
public function getSupportedImportFormats()
{
return array(
'rdfxml' => 'RDF/XML',
'n3' => 'N3'
);
}
/**
* @see Erfurt_Store_Adapter_Interface
*/
public function importRdf($graphUri, $data, $type, $locator)
{
// check type parameter
switch (strtolower($type)) {
case 'n3': // N3
case 'nt': // N-Triple (is N3 Subset)
case 'ttl': // Turtle (is N3 Subset)
$type = 'n3';
break;
case 'rdf': // RDF-XML
case 'rdfxml':
default: // RDF/XML is default
$type = 'rdfxml';
break;
}
$parser = $this->_rdfParser($type);
switch ($locator) {
case Erfurt_Syntax_RdfParser::LOCATOR_FILE:
$importSql = $this->_getImportSql('file', $data, $type, $graphUri);
break;
case Erfurt_Syntax_RdfParser::LOCATOR_URL:
// do some type guesswork
if (substr($data, -2) == 'n3' || substr($data, -2) == 'nt' || substr($data, -3) == 'ttl') {
$type = 'n3';
}
$dataString = $parser->fetchDataFromUrl($data);
if (!$dataString) {
throw new Erfurt_Store_Adapter_Exception(
'Error importing statements: Failed to retrieve data for URL: ' . $data
);
}
$importSql = $this->_getImportSql('string', $dataString, $type, $graphUri);
break;
case Erfurt_Syntax_RdfParser::LOCATOR_DATASTRING:
$importSql = $this->_getImportSql('string', $data, $type, $graphUri);
break;
default:
throw new Erfurt_Store_Adapter_Exception("Locator '$locator' not supported by Virtuoso.");
break;
}
try {
// import graph
$rid = $this->_execSql($importSql);
// parse namespace prefixes
$namespacePrefixes = $parser->parseNamespaces($data, $locator);
$namespaces = Erfurt_App::getInstance()->getNamespaces();
// store namespace prefixes
while (list($namespaceUri, $prefix) = each($namespacePrefixes)) {
try {
$namespaces->addNamespacePrefix($graphUri, $namespaceUri, $prefix);
} catch (Erfurt_Namespaces_Exception $e) {
// ignore
}
}
} catch (Erfurt_Store_Adapter_Exception $e) {
throw new Erfurt_Store_Adapter_Exception('Error importing statements: ' . $e->getMessage());
} catch (Erfurt_Syntax_RdfParserException $parserException) {
throw new Erfurt_Store_Adapter_Exception('Error parsing namespaces: ' . $parserException->getMessage());
}
// success
return true;
}
/**
* @see Erfurt_Store_Adapter_Interface
*/
public function init()
{
// create fulltext index rule and update index
$this->_createFullTextIndexRules();
}
/**
* @see Erfurt_Store_Adapter_Interface
*/
public function isModelAvailable($graphUri)
{
return array_key_exists((string)$graphUri, (array)$this->getAvailableModels());
}
public function isInSyntaxSupported()
{
return true;
}
/**
* @see Erfurt_Store_Adapter_Interface
*/
public function sparqlAsk($query)
{
$resultId = $this->_execSparql($query);
if (odbc_result($resultId, 1) == '1') {
return true;
}
return false;
}
/**
* @see Erfurt_Store_Adapter_Interface
*/
public function sparqlQuery($query, $options=array())
{
$resultFormat = isset($options[Erfurt_Store::RESULTFORMAT]) ?
$options[Erfurt_Store::RESULTFORMAT] :
Erfurt_Store::RESULTFORMAT_PLAIN;
// load query config variables
extract($this->_getQueryConfig($resultFormat));
// prepare query
$query = $queryPrefix
. PHP_EOL
. (string)$query;
if ($rid = $this->_execSparql($query)) {
$result = $this->_odbcResultToArray($rid);
// map single field to complete result
if ($singleField) {
// the result is in the first field of the first row
$result = current(current($result));
}
// convert XML result
if (null !== $converter) {
foreach ((array) $converter as $currentConverter) {
$converterClass = 'Erfurt_Store_Adapter_Virtuoso_ResultConverter_' . $currentConverter;
require_once str_replace('_', '/', $converterClass) . '.php';
$converter = new $converterClass();
$result = $converter->convert($result);
}
}
// encode as JSON string
if ($jsonEncode) {
$result = json_encode($result);
}
odbc_free_result($rid);
return $result;
}
}
// ------------------------------------------------------------------------
// --- Public Methods (Erfurt_Store_Adapter_Sql_Interface) ----------------
// ------------------------------------------------------------------------
/**
* @see Erfurt_Store_Adapter_Sql_Interface
*/
public function createTable($tableName, array $columns)
{
$colSpecs = array();
// Virtuoso-specific replacings
$replace = array(
'AUTO_INCREMENT' => 'IDENTITY',
'LONGTEXT' => 'LONG VARCHAR'
);
foreach ($columns as $columnName => $columnSpec) {
$colSpecs[] = PHP_EOL
. ' "' . $columnName . '" '
. str_ireplace(array_keys($replace), array_values($replace), $columnSpec);
}
$createTable = 'CREATE TABLE ' . (string)$tableName . ' (' . implode(',', $colSpecs) . PHP_EOL . ')';
return $this->sqlQuery($createTable);
}
/**
* @see Erfurt_Store_Adapter_Sql_Interface
*/
public function lastInsertId()
{
if ($rid = $this->_execSql('SELECT IDENTITY_VALUE()')) {
return (int)odbc_result($rid, 1);
}
}
/**
* @see Erfurt_Store_Adapter_Sql_Interface
* @todo Easier implementation
*/
public function listTables($prefix = '')
{
$tables = $this->_odbcResultToArray(
odbc_tables(
$this->connection(),
'db',
$this->_user,
(strlen($prefix) > 0) ? ($prefix . '%') : $prefix,
'TABLE, VIEW'
),
true,
'TABLE_NAME'
);
return $tables;
}
/**
* @see Erfurt_Store_Adapter_Sql_Interface
*/
public function sqlQuery($sqlQuery, $limit = PHP_INT_MAX, $offset = 0)
{
// replacings needed?
if ($limit < PHP_INT_MAX) {
$selectRegex = '/SELECT(\s+DISTINCT)?/i';
$selectReplace = sprintf('$0 TOP %d, %d', (int)$offset, (int)$limit);
$sqlQuery = preg_replace($selectRegex, $selectReplace, (string)$sqlQuery);
}
$resultArray = array();
if ($result = $this->_execSql((string)$sqlQuery)) {
$resultArray = $this->_odbcResultToArray($result);
}
return $resultArray;
}
// ------------------------------------------------------------------------
// --- Public Methods -----------------------------------------------------
// ------------------------------------------------------------------------
/**
* Builds a SPARQL-compatible literal string with long literals if necessary.
*
* @param string $value
* @param string|null $datatype
* @param string|null $lang
* @return string
*/
public function buildLiteralString($value, $datatype = null, $lang = null)
{
// This is a Virtuoso commercial edition feature... If we are running on open-source version, we remove the
// datatype, since otherwise loading will fail.
if ($this->_isOpenSourceVersion) {
if ($datatype === 'http://www.openlinksw.com/schemas/virtrdf#Geometry') {
$datatype = null;
}
}
return Erfurt_Utils::buildLiteralString($value, $datatype, $lang);
}
/**
* Builds a string of triples in N-Triples syntax out of an RDF/PHP array.
*
* @param $rdfPhpStatements A nested statement array
* @return string
*/
public function buildTripleString(array $rdfPhpStatements)
{
$triples = '';
foreach ($rdfPhpStatements as $currentSubject => $predicates) {
foreach ($predicates as $currentPredicate => $objects) {
foreach ($objects as $currentObject) {
// TODO: blank nodes
$resource = '<' . trim($currentSubject) . '>';
$property = '<' . trim($currentPredicate) . '>';
if ($currentObject['type'] == 'uri') {
$value = '<' . $currentObject['value'] . '>';
} else {
$value = $this->buildLiteralString(
$currentObject['value'],
array_key_exists('datatype', $currentObject) ? $currentObject['datatype'] : null,
array_key_exists('lang', $currentObject) ? $currentObject['lang'] : null
);
}
// add triple
$triples .= sprintf('%s %s %s .%s', $resource, $property, $value, PHP_EOL);
}
}
}
return $triples;
}
/**
* @see Erfurt_Store_Adapter_Interface
* @todo Rename countMatchingStatements
*/
public function countWhereMatches($graphUris, $whereSpec, $countSpec, $distinct = false)
{
if (empty($graphUris)) {
throw new Erfurt_Store_Adapter_Exception('No graph URI given.');
}
if ($distinct) {
$distinct = "DISTINCT";
} else {
$distinct = "";
}
// more error save
if ($countSpec == '?*') {
$countSpec = '*';
}
$fromSpec = implode('> FROM <', (array)$graphUris);
$countQuery = sprintf(
'SELECT COUNT %s (%s) FROM <%s> %s',
$distinct,
$countSpec,
$fromSpec,
$whereSpec
);
if ($rid = $this->_execSparql($countQuery)) {
$count = (int)odbc_result($rid, 1);
return $count;
}
return 0;
}
/**
* Recursively gets owl:imported model IRIs starting with $modelUri as root.
*
* @param string $modelUri
*/
public function getImportsClosure($modelUri)
{
$queryCache = Erfurt_App::getInstance()->getQueryCache();
if (!array_key_exists($modelUri, $this->_importedModels)) {
$models = array();
$result = array(
// mock first result
array('o' => $modelUri)
);
do {
$from = '';
$filter = array();
foreach ($result as $row) {
$from .= ' FROM <' . $row['o'] . '>' . "\n";
$filter[] = 'sameTerm(?model, <' . $row['o'] . '>)';
// ensure no model is added twice
if (!array_key_exists($row['o'], $models)) {
$models[$row['o']] = $row['o'];
}
}
$query = '
SELECT ?o' .
$from . '
WHERE {
?model <' . EF_OWL_NS . 'imports> ?o.
FILTER (' . implode(' || ', $filter) . ')
}';
$result = $queryCache->load($query, Erfurt_Store::RESULTFORMAT_PLAIN);
if ($result == Erfurt_Cache_Frontend_QueryCache::ERFURT_CACHE_NO_HIT) {
$startTime = microtime(true);
$result = $this->sparqlQuery($query);
$duration = microtime(true) - $startTime;
$queryCache->save($query, Erfurt_Store::RESULTFORMAT_PLAIN, $result, $duration);
}
} while ($result);
// unset root node
unset($models[$modelUri]);
// cache result
$this->_importedModels[$modelUri] = array_keys($models);
}
return $this->_importedModels[$modelUri];
}
/**
* Returns the last ODBC error message and number.
*
* @return string
*/
public function getLastError()
{
if (null !== $this->connection()) {
$message = sprintf('%s (%i)', odbc_errormsg($this->connection()), odbc_error($this->connection()));
return $message;
}
}
// ------------------------------------------------------------------------
// --- Protected Methods --------------------------------------------------
// ------------------------------------------------------------------------
/**
* Closes a current connection if it exists
*/
protected function _closeConnection()
{
if (is_resource($this->_connection)) {
// close connection
@odbc_close($this->_connection);
}
}
/**
* Creates a fulltext index to be used with bif:contains matching.
*
* @throws Erfurt_Store_Adapter_Exception
*/
protected function _createFullTextIndexRules()
{
$pre = microtime(true);
$this->_execSql('DB.DBA.RDF_OBJ_FT_RULE_ADD(NULL, NULL, \'' . self::FULLTEXT_INDEX_NAME . '\')');
$this->_execSql('DB.DBA.VT_INC_INDEX_DB_DBA_RDF_OBJ()');
if (defined('_EFDEBUG')) {
$logger = Erfurt_App::getInstance()->getLog();
$logger->info(sprintf('Creating Virtuoso full-text index: %f ms', (microtime(true) - $pre) * 1000));
}
}
/**
* Executes a SPARQL query and returns an ODBC result identifier.
*
* @param string $sparqlQuery
* @param string $graphUri
* @return ODBC result identifier
* @throws Erfurt_Store_Adapter_Exception
*/
private function _execSparql($sparqlQuery, $graphUri = null)
{
$graphUri = (string)$graphUri;
if (!empty($graphUri)) {
// enquote
$graphUri = '\'' . $graphUri . '\'';
$graphSpec = 'define input:default-graph-uri <' . $graphUri . '> ';
} else {
// set Virtuoso NULL
$graphUri = 'NULL';
$graphSpec = '';